"Helpful voice" joke

A woman is hurrying along a sidewalk when she hears a voice.. "Stop! Don't take another step!"

The woman freezes, and notices that with one more step she would have fallen into an uncovered manhole.

She moves on somewhat shaken and ready to step down the sidewalk to cross the street when she hears the voice again: "Stop! Don't do it!!"

She stops, petrified, and a second later a big truck rushes by out of control. She leans against a lamp post to compose herself when she hears the voice again, this time quite relaxed.

"I am your guardian angel," says the voice, "I assume you might have a question or two to ask me."

"Just one," answers the woman. "Where were you on my wedding day???!!! "